package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Employee;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*", filterName = "LoginCheckFilter")
public class LoginCheckFilter implements Filter {
    //    路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
        HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = httpServletRequest.getRequestURI();
        //定义不需要处理的请求路径
        log.info("拦截路径：{}", requestURI);
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //判断本次请求是否需要处理
        boolean check = Check(urls, requestURI);
        if (check) {
            log.info("本次请求不需要处理：{}", requestURI);
//            放行
            filterChain.doFilter(httpServletRequest, httpServletResponse);
            return;
        }
//        判断客户端用户是否登录，登录着放行
        if (httpServletRequest.getSession().getAttribute("user") != null) {
            Long userId = (Long) httpServletRequest.getSession().getAttribute("user");
            BaseContext.setCurrendId(userId);
            filterChain.doFilter(httpServletRequest, httpServletResponse);
            return;
        }
//        判断登录状态

        if (httpServletRequest.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}", httpServletRequest.getSession().getAttribute("employee"));
            //        获取线程中的id
            Long employee = (Long) httpServletRequest.getSession().getAttribute("employee");
//       存入到ThreadLocal中
            BaseContext.setCurrendId(employee);
            filterChain.doFilter(httpServletRequest, httpServletResponse);

            return;
        }
        log.info("用户未登录");
//        如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        httpServletResponse.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }

    //    定义方法检查路径是否放行
    public boolean Check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
